 If you liked
Tezuka Osamu no Buddha: Akai Sabaku yo! Utsukushiku
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 ...then you might like
Taiyou no Hou: El Cantare e no Michi
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Both are films depicting the file of the Buddha
While El Cantare is a narrative on how Happy science accounts for the creation and history of the world - with the Buddha's life being a climactic part of the story, Akai Sabaku is specifically about the Buddha's life and works.